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This javascript graphing tool allows you to quickly produce graphs with only a javascript enabled browser. It relies heavily on standard javascript Math functions, using a basic javascript evaluation to plot points. Basic javascript syntax will work, so be careful what you type in there. The variable "x" will behave like the x on a graphing calculator.

integrate("function",start,end,approximation_value): This will perform a numerical integration the function in quotation marks. Higher approximation_value leads to better results, but slower graphing. Somewhere between 50 and 1000 is reasonable, but too high of a number might hang your browser.
pow(x,n): Takes xⁿ. x^n on the other hand is reserved for the XOR operation in javascript.
2x: Don't do that, write out 2*x instead.
sin(x),cos(x),tan(x),asin(x),acos(x),atan(x),tanh(x) are implemented, consult a javascript reference on the Math class or various other syntax for more implemented functions.